With the release of OS X Lion and new MacBook Airs, Apple has made slight tweaks to the custom f-keys on their keyboard. The main change is that the Dashboard key (located on the F4) has now been replaced with a Launchpad key. The other change is that the Exposé button (located on the F3) key that is now used for Mission Control in Lion has seen a minor change to the icon.
Noticed by iSpazio the change has also propagated to Apple’s wired keyboards and one would presume it will soon make its way to the Apple wireless keyboard. Bundled keyboards with purchased iMac’s and Mac Pros should also soon ship with these slightly tweaked keyboards. Unfortunately these minor signage tweaks are about the extent of the changes to the Apple keyboards – no backlit keys or significant design changes.